they must have gone to the concert,后面是什么,mustn't they?这是英语的什么,部分否定?忘记了,
问题描述：
they must have gone to the concert,后面是什么,mustn't they?这是英语的什么,部分否定?忘记了,
答
haven't they?
must 表推测时,反意问句不能再用must,
建议你把must 改为I am sure 这个插入语,一下子便可以看出用什么动词了!
they ,I am sure,have gone to the concert,haven't they :)
请在客户端右上角评价点“满意”即可